linux-kernel - Re: [PATCH] arm64: allwinner: a64: orangepi-zero-plus2: add usb otg

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Date:   Thu, 7 Dec 2017 22:23:18 +0530
From:   Jagan Teki <jagannadh.teki@...il.com>
To:     Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:     Chen-Yu Tsai <wens@...e.org>, Icenowy Zheng <icenowy@...c.io>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Michael Trimarchi <michael@...rulasolutions.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        devicetree <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>,
        Jagan Teki <jagan@...rulasolutions.com>
Subject: Re: [PATCH] arm64: allwinner: a64: orangepi-zero-plus2: add usb otg

On Thu, Dec 7, 2017 at 7:04 PM, Maxime Ripard
<maxime.ripard@...e-electrons.com> wrote:
> Hi,
>
> On Thu, Dec 07, 2017 at 04:35:48PM +0530, Jagan Teki wrote:
>> Add usb otg support for orangepi-zero-plus2 board:
>> - Add usb_otg node with dr_mode as 'otg'
>> - USB0-IDDET connected to PA21
>> - VBUS connected through DCIN which always on
>>
>> Tested mass storage function.
>>
>> Signed-off-by: Jagan Teki <jagan@...rulasolutions.com>
>
> Did you test the OTG or peripheral modes?

dr_mode with otg and I've tested mas storage gadget with mmc disk emulation.

>
>> Note: Anyone please check vbus connection [1]
>> Since it is connected through DCIN of vcc-5v, I've added vcc-5v0
>> regulator for the same and attached to usb0_vbus-supply but it is
>> disabling during kernel boot.
>> [    1.887854] vcc5v0: disabling
>
> VBUS is the power line that is provided on the USB connector. In
> peripheral, that power is provided by the host, therefore it needs to
> be shutdown on the peripheral end. This is the expected behaviour.

So, in my test with 'otg' host drive the vbus so-it is disabling at
target end is it?

thanks!
-- 
Jagan Teki
Free Software Engineer | www.openedev.com
U-Boot, Linux | Upstream Maintainer
Hyderabad, India.